Two new glyptodonts are described for Costa Rica. The species Glyptotherium cf. arizonae and the dwarf glyptodont Pachyarmatherium leiseyi. This last species which was fi rstly recorded for the Upper Pliocene of Florida; its fi nding represents the southernmost record for Central America of these species.

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A rodent fossil fauna from La Palmera locality at San Carlos area is described. Four new species Tylomys watsoni, Reithrodontomys mexicanus, Sigmodon hispidus and Proechimys semispinosus are reported. A probably Upper Pleistocene age is assigned to this assemblage, because of the paleoflora associated with the rodents, which suggests a more temperate weather, probably a glacial age.

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